Procedures

In a large bowl, mix together corn flakes, oats, flour, brown sugar, and baking powder until combined. Add butter to the bowl and rub in, using your fingers, until dough has the consistency of wet sand.

3

Fill muffin cups halfway with corn flake mixture, pressing down with your fingers. Add one tablespoon of fruit preserves to each cup, then top with remaining cornflake mixture. Press down to smooth. Bake crumbles until golden brown, about 20 minutes. Let cool completely, then release from pan and serve.